A bunch of zombies that are used by the government to fight in a major war in the near future get launched into space. The space shuttle gets caught in a time warp and returns to Earth in the present day. Naturally, the zombies get loose and terrorize a motley assortment of folks who are trapped inside a high school.

Party house is actually portal to evil dimension, and horde of murderous beings slaughter partygoers, then homicidal children attack cars, before evildoers are all pulled back through the portal to invade another dimension.

Unsuspecting teenagers find out the urban legend of the cannibal cult is very true.